The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 2014
Filed:
Nov. 18, 2009
Applicants:
Leland H. Lyon, Roanoke, VA (US);
Warren Thomas Lay, Catawba, VA (US);
Inventors:
Leland H. Lyon, Roanoke, VA (US);
Warren Thomas Lay, Catawba, VA (US);
Assignee:
Center Rock Inc., Berlin, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 4/14 (2006.01); E21B 1/38 (2006.01); E21B 31/16 (2006.01);
U.S. Cl.
CPC ...
Abstract
A down-the-hole drill hammer is provided that includes a housing, a solid core piston mounted within the housing, a seal located between the solid core piston and the housing, and a backhead configured to exhaust working fluid volumes about a proximal end of the DHD hammer. The backhead includes a check valve assembly having a plug seal that can be moved to a closed seal position by gravity. A DHD hammer having a segmented chuck assembly is also provided. The segmented chuck assembly includes a plurality of chuck segments forming a cylindrical chuck assembly.